Improvement in tempering steel plates



H.. DISSTON & C. 'T. SHO EMAKER.

Tampering Steal Hates.

Patented Feb. 9,1375.

To an whom it'may concrm Be it known-that we,fHENR5Z DI ss'roN and v CHARLES T. SH'oEM'AKEm of Philadelphia, Pennsylvania, have invented certain Improvementsin Hardening or Temperin g 'andfefi'eetually. harden orte'mper saw-blades": and other Objects ofv steel by'causing them to traverse down a tine,throirgh which the .pro-

chimney.

. a vertical secti 'a transverse-section.

' 13, extends to a chimney,

pass through the pa by aplate, I, built 11 between which and Y to retract the rods-a from the plained hereafter.'

as to cause two endless erse in the direct-ion of the arrow. To the insides with t ing link. a.

that thehighestset of rods a project into the are under the control of the 1nent ways i,

,HAMI QN D-rss'roN, AND

anPi'aov aiaEar in TEMPE ante erasmares.

Specificationformiug part of Letters P atent No. 159,6592 December 30, 1874; v

,dated Febrnaryli, 1875; tion filed l Steel Plates, of which the following is a specification The object of our. invention is to rapidly ducts of combustion passj from .a furnace. to a ying drawing, Figure lis ono't' the apparatus, and'Fig. 2

hr the. accompan which an inoliiiedflue, l), the-said fluebeing termed by a parti'tion,-E, "betweentlie walls H H, which.are*continnations" of the side walls of the furi'i'ace. Aseries of rod sga, rtition E, and are gi ide'd. ito the side walls H Hf." The rods are arrangedin sets ot three in the present instance, 'n' Fig. 2, and the A is a furnace, from as-sho'wn 1 three rods-of each set-are secured to a bar, J, the partition E intervene a series of spiral springs,,oiiespring'surronnding each rod, the sprin gs having a tendency fine, as extwo pairs of both pairs being so driven chains. L L, to trav- G and G are chain-pulleys, oneor links of the chain are secured a series of plates, each plate m having an inclined rib, m, and each plateln having a straight rib, n. The plates m and n are arranged alternately throughout the endless chaimand the deepest )ortion of the'inclinedrib of one link, m, 00- he straight rib n of the adjoinlt will be observed, on reference to Fig. 1,

fine, as they straight-ribbed plateau of the endless chains, the plates traversing in contact with permaand release the saw-blade, I

- the flue, and i '.'the' highest rods .are'in this condition .a sawinto-the top of the flne B,

blade is intro placed on mitted. to res fleeting pin the endless ehaintraversesin the direction of the arrow, the highest rodsarei'ree from the control of the straigl said highest rods q. wi

dneed inclined partition E, and pertaith its edge against theprodown the partition 'E until it reaches the next .set of pins, by which the blade will be re- ,tained for a short time until released.

I Thus hladeafter blade is introduced into s caused to traverse" intermitthe. inclined partition E, eachblade, after being released by the lowest set of pins on, being permitted tofallthronghan 'openingq'e, into a cistern ing hardening-liquid. v. It will be observed that each blade, as; it passes down-the-inclined partition, is siibjected to a.constantly-increasing temperature until it is discharged at the proper heat for being hardened. by immersion. This planet subjecting the blades to a gradually-iuereasing temperature before immersion prevents undue. warping" of the said blades.

. We elaini as our invention- 1. The flue B, common with a chimney and at furnace, in combination with retaining and releasing rods 0. (1, caused to project into and t0 recede from the tine all substantially as set forth. I

2. The combination of the inclined fine B, the spring-rods a. and the endless chain with its ribbed plates in and n.

In testimony whereof we have signed our names to this specification in the presence oi two subscribing witnesses.

tent-1y down the other end with a HENRY DISSTON.

C. T. SHOEMAKER.

Witnesses:

' Wat. H. WRIGHT,

best observed in Fig. 2. While A. H. WSHOEMAKER.

or PHILADELPHIA, PEN

s, and here'it will remain until, es.

t-ri-bbed links, when the. ll receile-frointhe tlue B which will slide 1 or reservoir contain;

ieating at one'eud I 

